Imagine you are naming a range of packaged, vegan, meat-like pan-fry kebab products that come with different marinades. There's a Curry, a Döner Kebab, and a Gyro.
The final product of the range comes with no marinade or spices at all - it is "neutral".
Is there a common term in English that can be applied to a food product that is "neutral" in this sense?